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參數(shù)資料
型號(hào)： PCA9501PW,118
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 3/28頁(yè)
文件大小： 0K
描述： IC I/O EXPANDER I2C 8B 20TSSOP
標(biāo)準(zhǔn)包裝： 2,500
接口： I²C，SM 總線
輸入/輸出數(shù)： 8
中斷輸出： 是
頻率 - 時(shí)鐘： 400kHz
電源電壓： 2.5 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 20-TSSOP
包裝： 帶卷 (TR)
包括： EEPROM
配用： 568-4002-ND - DEMO BOARD I2C
其它名稱： 935271535118
PCA9501PW-T
PCA9501PW-T-ND
PCA9501_4
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 10 February 2009
11 of 28
NXP Semiconductors
PCA9501
8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM
8.
Characteristics of the I2C-bus
The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The two
lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the bus is not busy.
8.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
will be interpreted as control signals (see Figure 17).
8.1.1 START and STOP conditions
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line while the clock is HIGH is dened as the START condition (S). A
LOW-to-HIGH transition of the data line while the clock is HIGH is dened as the STOP
condition (P) (see Figure 18).
8.2 System conguration
A device generating a message is a ‘transmitter’; a device receiving is the ‘receiver’. The
device that controls the message is the ‘master’ and the devices which are controlled by
the master are the ‘slaves’ (see Figure 19).
Fig 17. Bit transfer
mba607
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig 18. Denition of START and STOP conditions
mba608
SDA
SCL
P
STOP condition
S
START condition
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